General description
The NXP Semiconductors SA56004X is an SMBus compatible, 11-bit remote/local digital temperature sensor with overtemperature alarms. The remote channel of the SA56004X monitors a diode junction, such as a substrate PNP of a microprocessor or a diode connected transistor such as the 2N3904 (NPN) or 2N3906 (PNP). With factory trimming, remote sensor accuracy of ±1 °C is achieved.
   
Features
■ Accurately senses temperature of remote microprocessor thermal diodes or diode
    connected transistors within ±1 °C
■ On-chip local temperature sensing within ±2 °C
■ Temperature range of −40 °C to +125 °C
■ 11-bit, 0.125 °C resolution
■ 8 different device addresses are available for server applications. The SA56004ED
    with marking code 56004E, and SA56004EDP with marking code 6004E are address
    compatible with the National LM86, the MAX6657/8 and the ADM1032.
■ Offset registers available for adjusting the remote temperature accuracy
■ Programmable under/overtemperature alarms: ALERT and T_CRIT
■ SMBus 2.0 compatible interface, supports TIMEOUT
■ Operating voltage range: 3.0 V to 3.6 V
■ I2C-bus Standard-mode and Fast-mode compatible
■ SO8, TSSOP8 and HVSON8 packages
■ Programmable conversion rate (0.0625 Hz to 26 Hz)
■ Undervoltage lockout prevents erroneous temperature readings
■ Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
   
Applications
■ System thermal management in laptops, desktops, servers and workstations
■ Computers and office electronic equipment
■ Electronic test equipment and instrumentation
■ HVAC
■ Industrial controllers and embedded systems